Standard Accuracy And Crystallization Process Of Plastic Moulds
The temperature of the plastic mold will reduce the specification accuracy of the product, resulting in a decrease in the qualified rate of the product. The temperature difference between the mold core and the cavity is too large, and the plastic part shortens unevenly, resulting in the circuitous deformation of the product and affecting the appearance of the product. If the temperature of the plastic mold is too high, the product will be deformed during and after demolding, and its shape and specification accuracy will be reduced.
For crystalline plastics of plastic molds, the use of high temperature of plastic molds is conducive to the crystallization process and avoids changes in specifications during storage or use. For plastic flexible plastics, the use of low temperature plastic molds can reduce the molding shortening rate, improve the specification accuracy of the parts, shorten the molding cycle, and improve production efficiency.
When the plastic mold is filled at low temperature, if the melt speed is not high enough, the internal stress of the product will increase, which will easily cause warping deformation or application cracking, especially for some high-viscosity plastics. The temperature of the plastic mold will reduce the activity of the plastic melt, making the parts unclear, and even filling the mold is not satisfied, or obvious cold seams will occur due to the excessive temperature drop of the melt front during the filling process, resulting in product damage. Mechanical properties decreased. Too low plastic mold temperature will also make the surface of the product not lubricated, resulting in various surface defects.
Pre-inspection of plastic molds
After the plastic mold is installed on the mold, it should be inspected to find out the quality problems in time, and the mold should be repaired to prevent it from being removed after being installed on the machine. Get it wrong.
Installation of plastic mold oblique guide mold:
When installing the mold, the two people should cooperate closely and pay attention to safety. If there is a mold with a lateral parting structure, the slider should be installed in a horizontal position, that is, the movable block moves left and right.
Fastening of plastic molds
When the mold positioning ring is installed in the positioning ring seat of the fixed template on the injection molding machine, close the mold at a very slow speed, so that the moving template can quietly press the mold, and then put the pressing plate on, and the pressing plate must be fitted with a gasket , It is necessary to install 4 pieces of pressing plate up and down, when the pressing plate is placed, it is necessary to pay attention to adjusting the height of the adjusting screw to the same height as the die foot, that is, the pressing plate should be flat. If the pressing plate is inclined, the die foot of the mold cannot be pressed very tightly. The side of the pressing plate should not be close to the mold to prevent friction and damage to the mold.
